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mnemonics: fix prefix extraction with non ASCII text

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moneromooo-monero 2015-06-21 11:28:16 +01:00
parent 1720affbd6
commit ea33cadebf
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2 changed files with 25 additions and 5 deletions
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8
src/mnemonics/electrum-words.cpp
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@ -99,7 +99,7 @@ namespace
{ {
if (has_checksum) if (has_checksum)
{ {
trimmed_word = it2->substr(0, (*it1)->get_unique_prefix_length()); trimmed_word = Language::utf8prefix(*it2, (*it1)->get_unique_prefix_length());
// Use the trimmed words and map // Use the trimmed words and map
if (trimmed_word_map.count(trimmed_word) == 0) if (trimmed_word_map.count(trimmed_word) == 0)
{ {
@ -144,7 +144,7 @@ namespace
{ {
if (it->length() > unique_prefix_length) if (it->length() > unique_prefix_length)
{ {
trimmed_words += it->substr(0, unique_prefix_length); trimmed_words += Language::utf8prefix(*it, unique_prefix_length);
} }
else else
{ {
@ -170,9 +170,9 @@ namespace
std::string checksum = seed[create_checksum_index(seed, unique_prefix_length)]; std::string checksum = seed[create_checksum_index(seed, unique_prefix_length)];
std::string trimmed_checksum = checksum.length() > unique_prefix_length ? checksum.substr(0, unique_prefix_length) : std::string trimmed_checksum = checksum.length() > unique_prefix_length ? Language::utf8prefix(checksum, unique_prefix_length) :
checksum; checksum;
std::string trimmed_last_word = last_word.length() > unique_prefix_length ? last_word.substr(0, unique_prefix_length) : std::string trimmed_last_word = last_word.length() > unique_prefix_length ? Language::utf8prefix(last_word, unique_prefix_length) :
last_word; last_word;
return trimmed_checksum == trimmed_last_word; return trimmed_checksum == trimmed_last_word;
} }

22
src/mnemonics/language_base.h
View file

@ -45,6 +45,26 @@
*/ */
namespace Language namespace Language
{ {
/*!
* \brief Returns a string made of (at most) the first count characters in s.
* Assumes well formedness. No check is made for this.
* \param s The string from which to return the first count characters.
* \param count How many characters to return.
* \return A string consisting of the first count characters in s.
*/
std::string utf8prefix(const std::string &s, size_t count)
{
std::string prefix = "";
const char *ptr = s.c_str();
while (count-- && *ptr)
{
prefix += *ptr++;
while (((*ptr) & 0xc0) == 0x80)
prefix += *ptr++;
}
return prefix;
}
/*! /*!
* \class Base * \class Base
* \brief A base language class which all languages have to inherit from for * \brief A base language class which all languages have to inherit from for
@ -70,7 +90,7 @@ namespace Language
(*word_map)[*it] = ii; (*word_map)[*it] = ii;
if (it->length() > unique_prefix_length) if (it->length() > unique_prefix_length)
{ {
(*trimmed_word_map)[it->substr(0, unique_prefix_length)] = ii; (*trimmed_word_map)[utf8prefix(*it, unique_prefix_length)] = ii;
} }
else else
{ {